The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A173558

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A173558

a(n) is the smallest number whose factorial has 10^n trailing zeros.
(history; published version)

#11 by R. J. Mathar at Tue Aug 22 15:08:43 EDT 2017

STATUS

editing

approved

#10 by R. J. Mathar at Tue Aug 22 15:08:38 EDT 2017

LINKS

A. M. Oller-Marcen, J. Maria Grau, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL14/Oller/oller3.html">On the Base-b Expansion of the Number of Trailing Zeros of b^k!</a>, J. Int. Seq. 14 (2011) 11.6.8

STATUS

approved

editing

#9 by Joerg Arndt at Sun Sep 29 12:24:37 EDT 2013

STATUS

proposed

approved

#8 by Michel Marcus at Sun Sep 29 07:55:28 EDT 2013

STATUS

editing

proposed

#7 by Michel Marcus at Sun Sep 29 07:55:01 EDT 2013

EXAMPLE

44!=2658271574788448768043625811014615890319638528000000000 (9 zeros) and 45!=119622220865480194561963161495657715064383733760000000000 (10^1= 10 zeros) ==> a(1)=45.

45!=119622220865480194561963161495657715064383733760000000000 (10^1= 10 zeros) ==> a(1)=45.

STATUS

proposed

editing

#6 by Michel Marcus at Sun Sep 29 07:54:26 EDT 2013

STATUS

editing

proposed

#5 by Michel Marcus at Sun Sep 29 07:54:15 EDT 2013

EXAMPLE

444!=2658271574788448768043625811014615890319638528000000000 (9 24 has no zeros) 45, and 5!=119622220865480194561963161495657715064383733760000000000 (10^120 has 1= (10 zeros^0) zero ==> a(10)=45 5.

44!=2658271574788448768043625811014615890319638528000000000 (9 zeros)

45!=119622220865480194561963161495657715064383733760000000000 (10^1= 10 zeros) ==> a(1)=45.

KEYWORD

base,nonn

STATUS

approved

editing

#4 by Russ Cox at Sat Mar 31 10:26:25 EDT 2012

AUTHOR

_José María Grau Ribas (grau.ribas(AT)gmail.com), _, Feb 21 2010

Discussion

Sat Mar 31

10:26

OEIS Server: https://oeis.org/edit/global/500

#3 by Joerg Arndt at Sat Jun 11 03:23:28 EDT 2011

STATUS

proposed

approved

#2 by José María Grau Ribas at Sat Jun 11 03:07:13 EDT 2011

AUTHOR

J.M. José María Grau Ribas (grau.ribas(AT)uniovigmail.escom), Feb 21 2010

STATUS

approved

proposed